Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 138-144.doi: 10.12108/yxyqc.20180617

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Multi-stage fracturing horizontal well interference test model and its application

LI Jiqing1, LIU Yuewu2,3, HUANG Can1, GAO Dapeng2,3   

  1. 1. Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430223, China;
    2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-06-05 Revised:2018-09-16 Online:2018-11-16 Published:2018-09-14

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Abstract: After the large-scale development of horizontal wells and well networks in shale gas fields, the problem of "fast pressure drop and premature gas well abandonment" caused by inter-well interference has become increasingly serious. It is urgent to understand the transient pressure of multi-stage fracturing horizontal wells under interference from adjacent wells and seepage characteristics. For this purpose, the shale reservoirs after multi-stage fracturing reformation of horizontal wells were firstly divided into three areas:fracturing fractures, SRVs and unmodified substrates. Then multi-zone coupled seepage model was established according to the characteristics of the pores in each region and the flow mechanism, and the model was numerically solved by using the PEBI grid and finite volume method. Through numerical simulation, the influences of factors such as connected permeability and agitation on the test results and pressure field distribution characteristics of interference wells were analyzed. Taking JY7-1 HF well and JY7-2 HF well in Jiaoyan 7 well group as examples, the average permeability of the connecting section between the two wells was 18.5 mD, which was calculated by interference test pressure fitting method, showing good connectivity. It is recommended that the gas production should be controlled in the later production process, while avoiding frequent replacement of working systems in adjacent wells. In the future, well pattern deployment should be based on the design productivity of a single well. The fracturing scale should be controlled for the interval close to the horizontal section of the adjacent wells, and the interference well test should be conducted in due course.

Key words: shale gas, multi-stage fractured horizontal well, interference well test, numerical simulation

CLC Number: 

  • TE373
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